Okay for general puposes, this is what I'd get to save $ and still have a kicka$$ system for the $.
CPU - $70
e2160 that you have selected! Good choice on a budget.
CPU HSF (if wanted) - $37 shipped!! Not much more than the ACF7 Pro, but performs much better. You will be able to OC quite well and keep the temps down.
XIGMATEK HDT-S1283 120mm Rifle CPU Cooler - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Frosty's review of the s1283
http://www.frostytech.com/articleview.cfm?articleID=223...
Mobo - ~$100 or ~$130 for the bigger siblings! About $100 savings!!
Gigabyte DS3L/Abit IP35-e/Asus p5K se mobo's or bigger siblings would do too.
Memory - $103 - $15 MIR = $88!! CAS 4 stuff, which will help you out when you OC your CPU!
Patriot Extreme Performance 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Case - $85 shipped! One of the best cases to get, you did your homework on this selection!!!
COOLER MASTER RC-690-KKN1-GP Mid Tower Case Retail
http://www.zipzoomfly.com/jsp/ProductDetail.jsp?Product...
PSU - $89 - $10 MIR = $79!!! One of the better PSU's to get in this price range. Has 41A on the 12V rail, so you can power any single GPU out there. 5 yr. warraty and power efficient. Need I say more?
CORSAIR CMPSU-550VX 550W Active Power Supply Retail ***Free Shipping***
http://www.zipzoomfly.com/jsp/ProductDetail.jsp?Product...
or
for a little more (52A on the 12V rail!!!): $110 - $20 MIR = $90!!!
CORSAIR CMPSU-650TX ATX12V / EPS12V 650W Power Supply 100 - 240 V UL, CE, CB, TUV, FCC, CCC - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
HD - $130 shipped! One of the better faster HD's out on the market. Has had good reviews and might be a bit better than the Samsung F1 you selected.
Western Digital Caviar SE16 WD6400AAKS 640GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive - OEM
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Total so far ~$615 - $25 MIR's = $590!! Now I'd probably wait for the Intel price cuts, which should be real soon, before I buy the CPU. If they fall down well than I'd probably consider getting the q6600 (hopefully falls below $200). Still use the CPU HSF that I listed above and enjoy the quad power at 3 gHz!!! This build above leaves about $400 for your new GPU in a couple of months, so you can decide if you want to wait for the newer GPU's or just get a 8800gts (g92) now or just save you $ for later. You would have the budget now for it, with about $150 to spare!